@Happy
Facts are facts and opinions are opinions. Sometimes they overlap as in when a person's opinions are the same as facts.
It's a fact (not an opinion) that the Earth and Moon orbit around a common centre of gravity.
It used to be a respected opinion that the Earth was the centre of the universe but now we know that view is wrong. It wasn't factual.
A fact is something true whilst an opinion can be true or false.
Why is it so hard to for some people to acknowledge that other people are sometimes just plain wrong?
Because they might not be wrong. They probably are wrong. But that doesn't make you right, only less wrong than them.
From a philosophical POV, this makes sense.
From a practical daily POV? It's a little different.
For example, Chuck on "Better Call Saul" has a phobia about electronics that causes a lot of suffering in his life and affects others in his life, and philosophically we might be able to say "he's probably wrong, but might not be; and all we can say is we're less wrong," but in the practical sense it seems that his concerns are existing in his mind and are disruptive to his life. there are potential long-term concerns about some technology to worry about -- there's no way to verify them yet through data -- but no one would bet money on his being right to the degree he is taking it.
So there's a way to view things operatively that has less problems with deciding certain POVs are not realistic.
We could talk about heliocentricism, but it was validated through measurement and experiment, whereas what it was replacing in some cultures was purely of religious belief trying to dictate as some kind of measurable practical reality.
Yeah, it kind of comes down to "faith" on some level in what belief is being held, and viewing contradictions as something that will eventually be explainable within their belief framework. It's understandable, not necessarily reasonable.